Climate Forcing, Sensitivity and Feedback Processes.

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Presentation transcript:

Climate Forcing, Sensitivity and Feedback Processes

Earths Climate System What have we learned? Earth is a planet Planetary temperature is determined by –Brightness of our star –Earth-sun distance –Albedo of the planet –Composition of Earths atmosphere So how can climate ever change? Energy In = Energy Out

Earths Climate System What have we learned? Earths overall temperature is determined by sunshine and albedo (-18 C) Temperature varies dramatically with height because of greenhouse effect! Surface temperature is much warmer (+15 C) than planetary radiation temp Molecules that have many ways to wiggle are calledGreenhouse molecules OOC H H O

Earths Energy Budget What have we learned? Surface climate depends on heating –51 units of absorbed solar –96 units of downward infrared (almost 2x sunshine)! Surface climate depends on cooling –117 units of upward infrared –23 units of evaporation, 7 units of rising thermals

Earths Climate as a Black Box Sunshine In Surface Temperature Out Climate System 1367 W m C S0S0 TSTS

Forcing (change in sunshine) Response: (Change in Surface Temperature) Climate System + 1 W m -2 ? °C DS0DS0 DTSDTS Climate Forcing, Response, and Sensitivity

Forcing (change in sunshine) Response: (Change in Surface Temperature) Climate Forcing, Response, and Sensitivity Lets do the math … A 1 W m -2 change in sunshine would produce about a 0.26 °C change in planets temperature

Climate Feedback Processes Positive Feedbacks (amplify changes) –Water vapor –Ice-albedo –High clouds DSDS DTSDTS D vapor D albedo D LW D hi cloud D lo cloud Negative feedbacks (damp changes) –Longwave cooling –Low clouds

Our Variable Star Changes of ~ 0.2% (= 2.7 W m-2) reflect 11-year sunspot cycle

Cycle of Solar Variability 11 Year Cycle of Magnetic Disturbances Active sun is ~ 0.1 % brighter than quiet sun

BOOM! Volcanos release huge amounts of SO2 gas and heat SO2 oxidizes to SO4 aerosol and penetrates to stratosphere SO4 aerosol interacts with solar radiation Mt. Pinatubo, 1991

Stratospheric Aerosol Forcing

Aerosol

Aerosol-Cloud Albedo Feedback Ship tracks off west coast Aerosol serves as CCN Makes more/smaller cloud drops Higher albedo

Learning from the Past

Estimating Total Climate Sensitivity At the Last Glacial Maximum (~ 18k years ago) surface temp ~ 5 K colder CO 2 was ~ 180 ppm (weaker greenhouse, 3.7 W m -2 more OLR) Brighter surface due to snow and ice, estimate 3.4 W m -2 more reflected solar Almost 3 x as sensitive as suggested by Stefan-Boltzmann alone … Other feedbacks must be going on as well

Note different scales Modern changes comparable to postglacial, but much faster! Greehouse Radiative Forcing

Reconstructed Radiative Forcings

The Past 2000 Years

Historical Thermometer Record

Comparison of Radiative Forcings